Why does the polar day and night phenomenon occur in Antarctica?

The South Pole is located south of the Tropic of Capricorn, and the South Pole is the polar night when the Sun shines directly on the Tropic of Capricorn, and the South Pole is the polar day when the Sun shines directly on the Tropic of Capricorn.

Polar day only occurs in the Antarctic Circle and the Arctic Circle, and when there is a polar day at the South Pole, there is a polar night at the North Pole, and vice versa. Because the rotation of the earth is tilted, in summer and winter, when the earth rotates, the north pole is towards the sun, and no matter how the earth turns, it is always towards the sun, so there is a polar day, and vice versa. The Antarctic Circle and the Arctic Circle are opposites, so when there is a polar day in the North Pole, there is a polar day in the South Pole, and vice versa.

Polar day and polar night only occur in summer and winter.

The so-called polar day means that the sun never sets and the sky is always bright, which is also called white night; The so-called polar night is the opposite of the polar day, the sun never comes out, and the sky is always dark. In the high latitudes of Antarctica, there is no "sunrise and sunset" rhythm of life, and there is no 24-hour day and night cycle. The alternation of day and night changes with increasing latitude, and the higher the latitude, the longer the polar day and the polar night.

At 90° south latitude, that is, at the South Pole, the alternation of day and night alternates for half a year, that is, the alternation of day and night there is a full year, half of the year is continuous day, half of the year is continuous night, and one day there is equivalent to a year on other continents. If you leave the South Pole, the lower the latitude, the more day or night it is, and the time of the polar day and night will gradually shorten. At 80°S, there are times when the polar day and night are other than the polar day and night, and there is a day-night cycle of 1 day and 24 hours.

If you are at the end of the polar day, the night is very short at first, and then the night is getting longer and longer, until finally it is all night, and the polar night begins. In the Antarctic Circle (66°33'S), there is only one full day (24 hours) of the year that is all day and one full day is all night. China's Antarctic Great Wall Station (62°13'S) is just outside the Antarctic Circle, and at one or two o'clock in the middle of the night in December, the sky is still cloudy and you can read and write with good eyesight.

This natural phenomenon of polar day and polar night also occurs at the North Pole, the other pole of the earth, but it occurs at the opposite time of the South Pole, and if the North Pole is in the polar day, the South Pole will be the polar night, and vice versa. The formation of the polar day and the polar night is caused by the rotation of the earth around its own inclined axis as it orbits the sun in an elliptical orbit. It turns out that when the earth rotates, the earth's axis and its perpendicular line form an approximate inclination angle, so when the earth rotates, there is always one of the poles facing the sun for 6 months, and it is all daytime; The other pole is turned away from the sun, and it is all night.

The North and South Poles are amazing natural phenomena that no other continent has.

Because the South Pole is the end point of the South Pole.

The South Pole is a very special position on the surface of the earth, it is one of the two points on the earth that has no directionality (the other point is the North Pole), standing on the South Pole, the three directions of east, west and south are completely meaningless, and there is only one direction in the north.

At the South Pole, the sun only rises and sets once a year, the sun never sets for half a year, it is all daytime, the sun revolves around the South Pole in a place not high from the horizon, and it never sets, also known as "polar day", there is no sun for half a year, it is all night, also known as "polar night". The time at the South Pole is actually in "International Standard Time", or Greenwich Mean Time.

Features:

The South Pole is covered with ice and snow all year round, with a thickness of 2,000 meters and an altitude of 2,800 meters. The climate is unusually harsh, with an average annual temperature of minus 48 degrees and an average summer temperature of minus 25 30 degrees, with the highest temperature ever recorded. The average winter temperature is minus 55-60 degrees, the lowest temperature recorded is minus zero, and the average annual precipitation is 3 mm.

The South Pole is not the highest point of the Antarctic ice sheet, and the snow and ice covering the South Pole move at a rate of about 10 meters per year, so scientists have to re-calibrate the latest position of the South Pole once a year to set a benchmark.

The above content refers to Encyclopedia - South Pole.